A SYSTEM FOR THE WIRELESS TRANSFER OF ELECTRICAL POWER

1 . A system ( 100 ) for the wireless transfer of electrical power to an electrical load ( 115 ) comprising:

a power supply device ( 105 ) and

a device to be powered ( 110 ), physically separate and independent from the power supply device,

wherein the device to be powered ( 110 ) comprises:

the electrical load ( 115 ) to be powered, and

a receiving apparatus ( 120 ) connected to the electrical load ( 115 ) and comprising at least one receiving inductive element ( 435 ),

wherein the power supply device ( 105 ) comprises a plurality of electrical power transmission sets ( 135 ), each of which includes:

a transmitting apparatus ( 145 ) comprising at least one transmitting inductive element ( 420 ) able to achieve an inductive coupling with the receiving inductive element ( 435 ), and

a power circuit ( 155 ) adapted to apply to the transmitting apparatus ( 145 ) a voltage wave that is periodically variable over time, and

wherein the transmitting inductive elements ( 420 ) of the transmission sets ( 135 ) individually have planar conformation and are globally positioned side by side on an operating surface ( 160 ) of the power supply device ( 105 ) in such a way as to form a grid.

2 . A system ( 100 ) according to claim 1 , wherein the transmitting inductive elements ( 420 ) individually have elongated shape.

3 . A system ( 100 ) according to claim 1 or 2 , wherein the transmitting inductive elements ( 420 ) have rectilinear development and are globally aligned by longitudinal rows and by transverse rows, where the transverse rows cross the longitudinal rows to define the grid.

4 . A system ( 100 ) according to any one of the previous claims, wherein each transmitting inductive element ( 420 ) consists of a wire segment or of a strip of electrically conductive material.

5 . A system ( 100 ) according to any one of the previous claims, wherein the operating surface of the power supply device ( 105 ) is a flat or curved surface.

6 . A system ( 100 ) according to any one of the previous claims, wherein the transmitting apparatus ( 145 ) of each transmission set ( 135 ) of the power supply device ( 105 ) further comprises:

at least one transmitting armature ( 165 ) connected to the corresponding power circuit ( 155 ) and positioned on the operating surface ( 160 ) of the power supply device ( 105 ) within a mesh ( 222 ) of the grid of transmitting inductive elements ( 420 ),

and wherein the receiving apparatus ( 120 ) of the device to be powered ( 110 ) further comprises:

a first receiving armature ( 175 ) connected to the electrical load ( 105 ) and adapted to face the transmitting armature ( 165 ) of a first transmission set ( 135 ) to achieve a first electrical capacity of a capacitive connection,

a second receiving armature ( 180 ) connected to the electrical load ( 105 ) and adapted to face the transmitting armature ( 165 ) of a second transmission set ( 135 ) to obtain a second electrical capacity of the capacitive connection.

7 . A system ( 100 ) according to claim 6 , wherein the transmitting apparatus ( 145 ) of each transmission set ( 135 ) of the power supply device ( 105 ) comprises a plurality of transmitting armatures ( 165 A) connected to the corresponding power circuit ( 155 ) and positioned within the same mesh ( 222 ) of the grid of transmitting inductive elements ( 420 ).

8 . A system ( 100 ) according to any one of claims from 6 to 7 , wherein the receiving apparatus ( 120 ) of the device to be powered ( 110 ) comprises two receiving inductive elements ( 435 A) able to achieve an inductive coupling with one or more transmitting inductive elements ( 420 ) of the power supply device ( 105 ), of which a first receiving inductive element connected in series between the first receiving armature ( 175 ) and the electrical load ( 115 ) and a second transmitting inductive element connected in series between the second receiving armature ( 180 ) and the electrical load ( 115 ).

9 . A system ( 100 ) according to any one of the previous claims, wherein the power circuit ( 155 ) of each transmission set ( 135 ) comprises at least one switching circuit ( 250 , 425 ) adapted to receive a driving signal and to connect the transmitting apparatus ( 145 ) to a voltage generator ( 140 ) in an intermittent and periodic manner, with a frequency equal to the frequency of the driving signal.

10 . A system ( 100 ) according to claim 9 , wherein the switching circuit ( 250 , 425 ) comprises a pair of electrical switches ( 255 , 260 ) connected in series between the voltage generator ( 140 ) and a reference potential, between said switches being comprised a central node ( 265 ) connected to the transmitting apparatus ( 145 ).

11 . A system ( 100 ) according to claim 9 , wherein the switching circuit ( 250 , 425 ) comprises an inductor ( 275 ) and a switch ( 280 ) connected in series between the voltage generator ( 140 ) and a reference potential, between said inductor and said switch being comprised a central node ( 285 ) connected to the transmitting apparatus ( 145 ).

12 . A system ( 100 ) according to any one of the previous claims, wherein each transmission set ( 135 ) further comprises:

a monitoring system adapted to detect a relative position between each transmission set ( 135 ) and the device to be powered ( 110 ),

a selection system adapted to select, based on the detection made by the monitoring system, an array of transmission sets ( 135 ) whose transmitting apparatus ( 145 ) is in suitable position to achieve the inductive coupling with the receiving apparatus ( 120 ) of the power supply device ( 105 ), and

a control system adapted to activate the power circuit ( 155 ) of the transmission sets ( 135 ) belonging to the selected array.